Weak coupling magnetism in Ce4Pt12Sn25: a small exchange limit in the Doniach phase diagram

• Published in: Journal of physics. Condensed matter 2010-02, Vol.22 (6), p.065601-065601
• Main Authors: Lee, Han-Oh, Kurita, Nobuyuki, Ho, Pei-chun, Condron, Cathie L, Klavins, Peter, Kauzlarich, Susan M, Maple, M B, Movshovich, R, Bauer, E D, Thompson, J D, Fisk, Z
• Format: Article
• Language: English
• Subjects: Condensed matter; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Crystal structure; Exact sciences and technology; Frustration; Magnetic permeability; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetization; Phase diagrams; Physical properties; Physics; Specific heat; Valence fluctuation, kondo lattice, and heavy-fermion phenomena
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/22/6/065601

Magnetic susceptibility, magnetization, specific heat, and electrical resistivity studies on single crystals of Ce4Pt12Sn25 reveal an antiferromagnetic transition at T(N) = 0.19 K, which develops from a paramagnetic state with a very large specific heat coefficient (C/T) of 14 J mol(-1) K(-2)-Ce just above T(N). On the basis of its crystal structure and these measurements, we argue that a weak magnetic exchange interaction in Ce4Pt12Sn25 is responsible for its low ordering temperature and a negligible Kondo-derived contribution to physical properties above T(N). The anomalous enhancement of specific heat above T(N) is suggested to be related, in part, to weak geometric frustration of f-moments in this compound.